Overview
The ISO721MDR from Texas Instruments is a single-channel, high-speed digital isolator designed to provide galvanic isolation between a logic input and output buffer. This device uses a silicon dioxide (SiO2) insulation barrier to achieve isolation of up to 4000VPK per VDE 0884-17. It is particularly useful in applications where noise currents on a data bus or other circuits need to be prevented from interfering with or damaging sensitive circuitry. The ISO721MDR operates from 3.3V and 5V supplies and is characterized for operation over an ambient temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Signaling Rate | 0 | - | 150 | Mbps |
| Propagation Delay | - | 12 | - | ns |
| Pulse Skew | - | 0.5 | - | ns |
| Supply Voltage (VCC1, VCC2) | 3 | - | 5.5 | V |
| High-Level Output Current (IOH) | - | - | 4 | mA |
| Low-Level Output Current (IOL) | -4 | - | - | mA |
| Ambient Temperature (TA) | -40 | - | 125 | °C |
| Junction Temperature (TJ) | - | - | 150 | °C |
Key Features
- 100 and 150Mbps signaling rate options
- Low-power sleep mode
- Typical 28-year life at rated working voltage
- High electromagnetic immunity
- Failsafe output
- Drop-in replacement for most opto and magnetic isolators
- Operates from 3.3V and 5V supplies
- –40°C to +125°C operating temperature range
- Safety-related certifications: DIN EN IEC 60747-17 (VDE 0884-17), UL 1577 component recognition program, IEC 61010-1, IEC 62368-1
Applications
- Factory Automation: Modbus, Profibus™, DeviceNet™ Data Buses
- Computer Peripheral Interface
- Servo Control Interface
- Data Acquisition
Q & A
- What is the primary function of the ISO721MDR?
The ISO721MDR is a digital isolator that provides galvanic isolation between a logic input and output buffer, preventing noise currents from interfering with sensitive circuitry.
- What are the signaling rate options for the ISO721MDR?
The ISO721MDR supports signaling rates of up to 150Mbps.
- What is the typical propagation delay of the ISO721MDR?
The typical propagation delay is 12ns.
- What is the operating temperature range of the ISO721MDR?
The device operates over an ambient temperature range of –40°C to +125°C.
- Does the ISO721MDR have safety-related certifications?
- What are some common applications for the ISO721MDR?
- Can the ISO721MDR operate with both 3.3V and 5V supplies?
- What is the failsafe output feature of the ISO721MDR?
The failsafe output feature drives the output to a logic-high state if the input is unpowered or not being actively driven for more than 4μs.
- Does the ISO721MDR have a low-power sleep mode?
- What is the typical life expectancy of the ISO721MDR at rated working voltage?
